Create ROADMAP.md

Author: probonopd

ROADMAP.md

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+# AppImageKit roadmap
+
+Volunteers wanted for the following topics. Feel free to send a PR that adds your name to list item(s).
+
+## Downloading appimages from some kind of software catalog websites and app centers
+
+* Define formal AppImage spec (probonopd)
+* Work on tool that lets one extract metadata like application name, author, license, etc. from an AppImage hosted somewhere without having to download it (think "Google for AppImages")
+* Get AppImage downloads into KDE Discover
+* Write GNOME Software plugin for AppImage
+
+## Running  appimage and browsing its content  via file roller/ark or any other archive tool
+
+* Follow up with upstream projects and/or send PRs
+* file-roller
+* ark
+
+## Upgrading appimage via right click
+
+* Make zsync_curl use subsequent range requests rather than requesting multiple ranges at once; otherwise Akamai is broken
+* Make AppImageUpdate not need the curl binary but expand zsync_curl to include the required curl functionality
+* Possibly replace the AppImageUpdate bash script by C code, e.g., in zsync_curl
+* Qt GUI in addition to the Vala/GTK 3 one
+
+## Desktop integration
+
+* Resurrect appimaged (probonopd; contact me if you want to take this over)
+* Sandbox using firejail (see the sandbox GUI integration experiments in this repository)
+* Test/use GNOME portals